The side-crosstalk characteristics of a single-pole type head in perpendicular magnetic recording were measured comparing with those of the ring type head in longitudinal magnetic recording. The off-track distance in perpendicular magnetic recording is rather less than that in longitudinal magnetic recording, and it is independent of the write current. These experimental results show that the side-writing width and the dependence of crosstalk on the write current in perpendicular recording is much smaller than that in longitudinal magnetic recording.
The multi-track cross azimuth SPT head was proposed and tested. The crosstalk in the wide range of off-track distance more than 26.5 μm is less than −26 dB, which satisfys the criterion for the normal operation of the disk drives. It has been found that the crosstalk between the heads existed in the multi-track cross azimuth head when the distance of the main poles is short, but this crosstalk can be reduced by 7 dB when the unused coil is shortened both in writing and in reading.